JPH0553948A - Inter-process communication system - Google Patents

Abstract

PURPOSE:To eliminate necessity for handling a buffer having plural structures during a processing for a communication line server to transmit a received telegraphic message to a task requesting the reception. CONSTITUTION:Plural tasks 2-1-2-n and a communication line server 3 are operated on a computer 1, and the telegraphic message received from a communication line 6 is processed in the computer 1. The tasks 2-1-2-n process the telegraphic message received from the communication line 6 by the communication line server 3. The communication line server 3 controls the reception from the communication line 6, registers the task transmitting the request of starting the reception as a message on a registration table 4, acids a message header to the received telegraphic message, stores the end processing completion reporting method in this header, transmits the telegraphic message to the tasks 2-1-2-n starting the request of the reception, receives the next telegraphic message when the completion of an end processing is reported from these tasks, and erases the task from the task registration table 4 when the request of reception end is received from that task.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interprocess communication system, and more particularly to an interprocess communication system in which a task to be received receives a received message from a communication line server in a system which communicates through a communication line.

[0002]

2. Description of the Related Art In the conventional inter-process communication method, a step for allocating a buffer for a message to be received by a task to receive a message from a memory pool and sending it as a reception request message to a communication line server, and receiving a reception request After that, when the communication line server receives a message from the line, the step of storing the received message in the buffer prepared in the message sent by the task that wants to receive and returning it to the task, and the task ending process of the message And the steps to do.

[0003]

In this conventional interprocess communication system, when a communication line server receives a reception request from a plurality of tasks and each task handles a buffer having a different structure, the communication line server receives the request. Before doing so, there is a problem that the buffer to be used must be used properly in order to receive a message whose destination is unknown.

The object of the present invention is to solve the above-mentioned problems,
The task that wants to receive enables the communication line server to acquire itself from the memory pool by notifying the communication line server in advance of the notification method of the received message, and does not use buffers with different structures depending on the task of the sender of the message. The purpose is to provide an interprocess communication method.

[0005]

The interprocess communication system of the present invention is a system for performing communication through a communication line, and receiving from a communication line server which is a general-purpose task for receiving a message from the communication line and controlling the communication. In the inter-process communication in which the task to be performed receives the notification of the received message, the first means for the task to receive to notify the communication line server by a message transmission of the reception start request and the method of transmitting the received message, and reception start When the communication line server receives a message from the line after receiving the request, the communication line server reserves a buffer from the memory pool, adds a message header to the beginning of the message, and gives a message indicating the processing completion notification method of the message end process. The second means for storing the message in the header and sending the message as a message to the task, and the task that received the message Performs the termination process, and a third means notifying the completion of processing to the communication line server by the indicated in the message header process.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a system configuration diagram of an embodiment of the present invention, showing an example of the configuration of a computer system to which the present invention is applied.

This computer system is composed of a computer 1 and a communication line 6, and has a form in which a message received from the communication line 6 is processed in the computer 1.

In the computer 1, a plurality of tasks 2-1
.. 2-n and the communication line server 3 operate, and a memory pool 5 is prepared.

Tasks 2-1 to 2-n are tasks for processing a telegram received by the communication line server 3 from the communication line 6.

The communication line server 3 is a task for controlling reception from the communication line 6, and has a task registration table 4 for registering a task for which a reception start request is made. When the transmitted task is registered and a message is received, a message header is added to the received message, the termination processing completion notification method is stored in the added message header, and task 2 that requests reception start
A message is sent to -1 to 2-n, and when the completion processing is notified from the tasks 2-1 to 2-n, the next message is received and a reception completion request is issued from the tasks 2-1 to 2-n. And the tasks 2-1 to 2-for which the reception end request is issued from the task registration table 4.
Delete n.

FIG. 2 is a flow chart showing an example of the processing of the tasks 2-1 to 2-n of FIG. 1, and FIG. 3 is a flow chart showing an example of the processing of the communication line server 3 of FIG. Below, Figure 2
The operation of this embodiment will be described with reference to FIG.

When the tasks 2-1 to 2-n are activated, as shown in FIG. 2, first, a message of a reception start request is transmitted to the communication line server (T1), and a message transmission from the communication line server is received. Wait (T2).

When the communication line server 3 is started, as shown in FIG. 3, first, a buffer for receiving a message is acquired from the memory pool 5 (S1) and waits for reception (S2).

If the received one is a reception start request from the tasks 2-1 to 2-n (S3). The tasks 2-1 to 2-n for which the reception start request is made are added to the table 4 (S4).

If the received message is a message from the communication line 6 (S5), a message header for storing message information is added to the received message (S6), and the added message header is sent to the communication line server 3. The end processing completion notification method is stored (S7), the task registration table 4 is referenced to receive the message, and the message is transmitted to the tasks 2-1 to 2-n as a message (S8). Then, Task 2-
Waiting for completion of termination processing from 1 to 2-n (S9).

Tasks 2-1 to 2-n are communication line server 3
When receiving the message from, the message in the message is read and the processing unique to tasks 2-1 to 2-n is performed (T
3).

Next, the method of notifying the end processing completion to the communication line server 3 is read from the message header of the received message (T4), and the message buffer is returned to the memory pool 5, that is, the end processing of the message is performed ( Tasks 2-1 and 2-2 according to the termination processing completion notification method to the communication line server 3 read during the processing of T5) and T4.
-N notifies the communication line server 3 of the completion processing of the message (T6).

If the content of the message read during the processing of step T3 indicates that it is the last message to the tasks 2-1 to 2-n (T7), the communication line server 3 finishes receiving. A request message is transmitted (T8).

The communication line server 3, as shown in FIG.
What is received in the processing of step S2 is tasks 2-1 and 2-2.
If the message is a reception end request message from -n (S10), the tasks 2-1 to 2-n for which the reception end request is made are deleted from the task registration table 4.

What is received in the process of step S2 is the message of the reception start request from the tasks 2-1 to 2-n,
If neither the message from the communication line 6 nor the reception end request message from the tasks 2-1 to 2-n, the communication line server 3 ends the process.

[0022]

As described above, according to the present invention, in the interprocess communication system, the reception start request and the transmission method are received by the first step in which the task to be received notifies by the message transmission and the reception start request. When the communication line server receives a message from the line, the communication line server allocates a buffer from the memory pool, adds a message header to the beginning of the message, stores the message end processing completion notification method in the message header, and Is sent as a message to the task that requested to start reception, and the task that received the telegram performs the end processing of the telegram, and the third step that notifies the communication line server of the processing completion by the method indicated in the message header. With the provision of, the task to be received can notify the communication line server in advance of the method of notifying the received message. Communication line server I becomes possible to obtain from its own memory pool, an effect that it is not necessary to distinguish a buffer with different structures by telegram sender task.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of an embodiment of the present invention.

2 is a flowchart showing an example of processing of tasks 2-1 to 2-n in FIG.

3 is a flowchart showing an example of processing of a communication line server 3 of FIG.

[Explanation of symbols]

 1 computer 2-1 to 2-n task 3 communication line server 4 task registration table 5 memory pool 6 communication line

Claims (1)

[Claims] 1. An inter-process communication in which a task to be received is notified of a received message from a communication line server, which is a general-purpose task that receives a message from the communication line and controls communication in a system that communicates through the communication line. In the above, in the first method, the task to receive the reception start request and the transmission method of the reception message notifies the communication line server by sending a message, and the communication line server receives a message from the line after receiving the reception start request. Upon reception, the communication line server reserves a buffer from the memory pool, adds a message header to the beginning of the message, stores the processing completion notification method of message termination processing in the message header, and sends the message as a message to the task. A second means of doing
An interprocess communication, characterized in that the task receiving the message performs a message termination process and third means for notifying the communication line server of the completion of the process by the method indicated in the message header. method.